Fix syntax error

Author: xhochy

Tools/jit/_llvm.py

@@ -70,7 +70,7 @@ async def _get_brew_llvm_prefix(*, echo: bool = False) -> str | None:
 @_async_cache
 async def _find_tool(tool: str, *, echo: bool = False) -> str | None:
     # Explicitly defined LLVM installation location
-    if llvm_tools_dir := os.getenv("LLVM_TOOLS_INSTALL_DIR")):
+    if llvm_tools_dir := os.getenv("LLVM_TOOLS_INSTALL_DIR"):
         path = os.path.join(llvm_tools_dir, tool)
         if await _check_tool_version(path, echo=echo):
             return path